Access fields creating by scheming inside action

Is there anyway to access the fields created by scheming extension inside my action function (i.e organization list) by doing something like this
`model.Group.title_ar`

No file, test, or entry point is named. Start by locating the scheming-created fields and the action function in the CKAN extension, then determine whether the requested access pattern is supported. Done would be a confirmed access method or a documented change covering fields such as the organization list.

Written by the indexing model from the issue text.